ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2014
·
IF 5.481
Yue Liu,Qingfeng Wang,Rongjun Mei,Haiqiang Wang,Xiaole Weng,Zhongbiao Wu
Recently, simultaneous removal of SO2, NOx and oxidized mercury in wet flue gas desulfurization (WFGD) scrubber has become a research focus. Mercury re-emission in traditional WFGD system has been widely reported due to the reduction of oxidized mercury by sulfite ions. However, in multipollutants simultaneous absorption system, the formation of a large quantity of nitrate and nitrite ions as NOx absorption might also affect the reduction of oxidized mercury in the aqueous absorbent. As such, this paper studied the effects of nitrate and nitrite ions on mercury re-emission and its related mechanism. Experimental results revealed that the nitrate ions had neglected effect on mercury re-emission while the nitrite ions could greatly change the mercury re-emission behaviors. The nitrite ions could initially improve the Hg0-emission through the decomposition of HgSO3NO2–, but with a further increase in the concentration, they would then inhibit the reduction of bivalent mercury owing to the formation of Hg-nitrite complex [Hg(NO2)x2-x]. In addition, the subsequent addition of Cl– could further suppress the Hg0 emission, where the formation of a stable Hg-SO3–NO2–Cl complex was assumed to be the main reason for such strong inhibition effect.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Min Yang,Yujia Yan,Huanxian Shi,Enzhou Liu,Xiaoyun Hu,Xu Zhang,Jun Fan
In this work, the fluorescent sensors based ternary ZnCdS quantum dots (QDs) were constructed for nitrite (NO 2 − ) detection, and ternary ZnCdS QDs were synthesized by a rather facile, low-cost and effective aqueous synthesis method using air-stable compounds. Experimental results indicated that the ZnCdS QDs fluorescence (PL) emission intensity was decreased gradually with the introduction of NO 2 − . Importantly, the F/F 0 (F and F 0 were the PL intensity in the presence and absence of NO 2 − at 505 nm, respectively) was linearly proportional to the NO 2 − to 700 μM, the equation of linear regression was y = −0.123x+1.1525, which showed a better performance to the detection of NO 2 − . Moreover, there was no interference to other interfering substances including metal ions and anion ions. Thus, we applied the ZnCdS QDs fluorescence sensors to detect the contents of NO 2 − in ham sausage and the results showed that the contents of NO 2 − in ham sausage was 18.45 mg/kg. Therefore, this test method had the advantages of simplicity, rapidity and high sensitivity.
研究领域:
分析化学
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生物传感
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食品科学
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DOI
高影响因子
Environmental Science-Nano
·
2023
·
IF 7.3
Ruixue Wang,Kun Li,Narcisse Tsona Tchinda,Wenxing Wang,Lin Du
Ammonia (NH3), the most common alkaline gas in the atmosphere, participates in heterogeneous reactions on the surface of aerosols and produces ammonium (NH4+). While most previous studies have focused on the effect of NH3 on the heterogeneous reactions of other gases on mineral dust aerosols, little research has been done on the heterogeneous reactions of NH3 influenced by acidic gases. Here, the effects of sulfur dioxide (SO2), formic acid, acetic acid and acrylic acid on the heterogeneous reaction of NH3 on the surface of nano α-Fe2O3 particles were investigated. We found that NH3 can promote the dissolution of α-Fe2O3 through NH3–Fe complexation and be oxidized to NO3−, while the addition of acidic gas inhibits the NH3–Fe complex formation and converts it into physical adsorption. SO2 promoted the conversion of NH3 to NH4+, while weakly inhibiting the oxidation of NH3 to NO3− by competing for oxidation sites under light conditions. Organic acids, on the other hand, inhibited the heterogeneous conversion of NH3, and strongly competed for oxidation sites under light conditions, significantly reducing NO3− production. This study reveals the various influences of acidic gases on NH3 heterogeneous reactions on α-Fe2O3 particles, which helps to improve the understanding of atmospheric processes involving NH3, acidic gases, and mineral dust aerosols.
研究领域:
大气化学
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环境科学
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DOI
高影响因子
Nanoscale Advances
·
2018
·Vol. 1
·期 3
·1207-1214
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IF 0
Mohammed Hassan Ibrahim,Zhonghua Xue,Hassan Idris Abdu,Mahgoub Ibrahim Shinger,Ahmed Mahmoud Idris,Murtada Mohamed Edris,Duoliang Shan,Xiaoquan Lu
Nitrite ions (NO2−), as one of the important inorganic anions, exhibit considerable effects towards the environment and human health. Moreover, over intake of this anion may cause dangerous diseases. Herein, we successfully fabricated silver nanoparticles (AgNPs) using 4-amino-5-hydroxynaphthalene-2, 7-disulphonic acid monosodium salt (AHNDMS) and functionalized them with p-aminobenzoic acid (PABA), and used the functionalised AgNPs as a sensitive and selective colorimetric sensor for nitrite ions. The structure of the as-prepared pure AgNPs was experimentally characterized by different characterizations methods, namely, UV-vis, FT-IR, CV, DPVs, SEM, TEM, and XRD. Additionally, the nitrite ion sensitively and selectively changes the brownish yellow color of the dispersed AgNPs to pinkish red, indicating aggregation of AgNPs, with a detection limit of 0.016 ppm (0.348 μM) and 0.0069 ppm (0.149 μM) by the naked-eye and by UV-vis spectroscopy, respectively. The color change suggested that the aggregation of AgNPs was induced by nitrite-selective diazo-coupling. UV-vis spectra show the disappearance of the absorbance at 474 nm and appearance of a new peak at 532 nm, presumably due to the conversion of AgNPs to silver ions. Moreover, the studies of interference in the proposed sensor confirm its selectivity in the presence of anions as well as cations. Furthermore, linearity was observed between the absorption and the concentration of nitrite ions. More importantly, the proposed sensor was practicably applied for the determination of nitrite in different water samples, such as distilled water, river water, and tap water.
研究领域:
环境科学
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分析化学
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DOI
PubMed
MATERIALS RESEARCH BULLETIN
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2025
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IF 5.7
Hangxi Liu,Haorong Sun,Peng Zhao,Kangle Shang,Ming Fang,Xiaoli Tan,Long Yu,Bin Ma
Nitrite ions originate from various natural and anthropogenic sources and can cause health issues including methemoglobinemia and potential carcinogenic effects. As the nitrite in water has become an increasing threat to human health, the accurate evaluation of nitrite is urgently needed for environmental quality and safety management. In this paper, we designed a CTAB/SF5/GCE sensor, which exhibited an obvious enhancement compared to the pristine glassy carbon electrode (GCE). The morphology characterization confirmed the hexagonal nanosheets of SnS 2 and the even distribution of Fe element. The energy band, Tafel plots, and EIS spectroscopy were employed to investigate the enhancement mechanism, demonstrating that improving charge transfer on the sensing interface is crucial in enhanced signals. Cyclic voltammetry (CV) was adopted as the electrochemical method to measure the nitrite in water and a sensitivity of 0.129 μA·μM −1 was exhibited in the range of 30–500 μM, and the limit of detection (LOD) was calculated to be 6.51 μM. The reliability including the repeatability, reproducibility, and stability of this sensor were estimated and showed satisfactory results. The test in real samples and the assessment of interfering substances showed the CTAB/SF5/GCE possesses a large potential in the practical application of electrochemical sensing of nitrite.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Fang Xu,Yukuai Zhang,Longfei Su,Zhenxing Guo,Qiang Cheng,Liqiang Xu,Feng Wang,Guoping Sheng
Understanding the environmental fate of chemical herbicides is crucial to sustainable agriculture. Due to their joint-use with nitrogen fertilizers, their residues often coexist with NO3– in agricultural drainages. In this study, tribenuron-methyl was used as a model to evaluate the role of NO3– in the phototransformation of chemical herbicides, which was characterized by a two-stage process. Initially, a slow hydrolysis occurs (kobs = 2.573 × 10–4 min–1), producing two hydrolysis products: methyl-2-(aminosulfonyl)-benzoate (MSB) and 2-methyl-4-methylamino-6-methoxy-1, 3, 5-triazine (MMT), which can be significantly accelerated by solar irradiation (kobs = 2.152 × 10–2 min–1). Subsequently, MSB undergoes a rapid NO3–-initiated photodegradation process (kobs = 2.251 × 10–2 min–1). MMT was identified as the refractory unit and undergoes a slow NO3–-initiated photodegradation process (kobs = 4.494 × 10–4 min–1). The underlying mechanisms were elucidated through electron paramagnetic resonance spectroscopy and reactive species quenching experiments. This study fills a knowledge gap on the interaction between NO3– and chemical herbicides, highlighting the pivotal role of NO3– in the phototransformation of chemical herbicides.
研究领域:
环境科学
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农业科学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Long Zeng,Qingyun Tian,Ting Gao,Tian Luo,Shuochen Wang,Hui Wang,Zhen-Hong He,Yu Huang,Carolina Belver,Detlef W. Bahnemann,Chuanyi Wang
The efficient conversion of NO to NO 3 - and the generation of the by-product NO 2 are considered to be highly competitive reactions during the photocatalytic conversion of low concentrations of nitrogen oxides in the ambient atmosphere. However, achieving highly selective photocatalytic conversion of NO to NO 3 - remains a great challenge in current research. In this work, we successfully prepared a bismuth tungstate (BWO-40) with a microcrystalline domain, combines amorphous and crystalline structure, co-modified by oxygen vacancies (OVs) and bismuth (Bi) dual active sites. The composite photocatalyst exhibited a remarkable photocatalytic efficiency of 73.49%, reaching more than twice the efficiency of pure Bi 2 WO 6 , BWO-0 (26.66%), for NO conversion under visible light (λ ≥ 420 nm). The photocatalytic performance of BWO-40 significantly enhanced due to the synergistic effect between Bi and OVs as well as its microcrystalline structure. This not only facilitates the utilization of solar energy but also provides additional adsorption, thus improving the activation of reactant molecules while effectively suppressing the conversion of NO into the toxic by-product NO 2 (10.82 ppb). Furthermore, in-situ DRIFTS was used to investigate the adsorption and photocatalytic conversion pathways of NO. This work provides a feasible solution for achieving the highly selective conversion from low concentration of NO to NO 3 - of about 99% and effectively inhibiting the production of NO 2 .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Huifang Wu,Changlun Tong
Nitrite (NO2–) and mercury (Hg2+) ions are recognized as two typical inorganic contaminations that can cause severe damage to the environment and humans. In this paper, the energy transfer from carbon quantum dots (CQDs) to Tb3+ by the antenna effect was found, which can promote the f–f transition of Tb3+ and emit strong characteristic fluorescence of Tb3+. Based on CQD-Tb3+ and 3-aminophenylboronic acid (APBA), which have respectively sensitive and specific fluorescent response to NO2– and Hg2+ with different fluorescent signals, a dual-emission fluorescent probe of the CQD-Tb3+/APBA hybrid was thus fabricated for the simultaneous detection of NO2– and Hg2+ in environmental water samples. They emit dual-emission fluorescence peaks centered at 373 and 545 nm, respectively. A good linearity between the quenching efficiency of (F0 – F)/F0 and the concentrations of NO2– and Hg2+ was in the range of 5.0–1200.0 nM for NO2– and 0.1–6.0 μM for Hg2+. The limit of detection (LOD, 3σ/K) is ultrasensitive for NO2– (2.0 nM), and the LOD for Hg2+ is 38.1 nM. The dual-emission fluorescent probe was successfully applied for the determination of NO2– and Hg2+ in various environmental water samples. The possible luminescence and fluorescence quenching mechanisms of the probe are also discussed in detail. This study provides a new approach for fabricating a multifunctional fluorescent probe or sensor and a prospective application in environmental monitoring.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 9
·6459-6470
·
IF 2.993
Feng Zhibiao,Li Zeliang,Zhang Xingwei,Xu Guoqiang,Zhou Nan
Herein, we report the synthesis of carbon dots (CDs) with two characterized absorption bands but without excitation wavelength-dependent fluorescence via a one-step hydrothermal method. The structure of CDs was characterized using X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, Fourier transform infrared, and UV–Vis spectroscopy. The structure and photoluminescence of CDs vary significantly with different raw materials and preparation methods, and the mechanism of luminescence is not clear yet. Hence, we studied the luminescence mechanism behind two characterized absorption bands of CDs using fluorescence quenching method with ninhydrin and several ions as quenchers. The influence of the surface groups of CDs on its photoluminescence properties was also discussed. Ninhydrin and a variety of other ions exhibited different quenching effects on the fluorescence emissions which obtained at the two absorption bands of CDs. Combining with the structure characterization results, it can be concluded that the emission wavelength is mainly determined by the carbon core, while the excitation wavelength is determined by the surface nitrogen-containing groups. (The excitation at 234 nm might be due to the Schiff base structure, while the excitation at 345 nm was mainly due to the amide structure.) Furthermore, based on the interaction of NO 2 − with the surface nitrogen-containing groups of CDs, a quantitative detection method of NO 2 − using CDs was proposed in our study. CDs exhibited high selectivity for NO 2 − at pH 1.6 with good linearity to NO 2 − concentration in the range of 1–10 μM.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Xue Li,Xue Zhao,Jiapei Lv,Xiuxiu Jia,Shuxing Zhou,Yimin Huang,Fengqin Chang,Hucai Zhang,Guangzhi Hu
Electrochemical techniques have shown advantages for the removal of low-concentration nitrate. Here, copper oxide nanosheets were grown on self-supporting nickel foam (NF) to prepare electrodes (CuO/NF), which realized the rapid and highly selective conversion of nitrate pollutants in sewage into nontoxic and harmless N 2 . The CuO/NF afforded 100% NO 3 – removal within 100 min and 99.53% selectivity for N 2 at –50 mA without producing a lot of by-products (NO 2 – , NH 4 + , and N 2 H 4 ). Furthermore, 81.8% of NO 3 – was removed under the given conditions after six experimental repetitions. These results suggest that the catalyst has excellent electrochemical stability. The performance of CuO/NF for the electrocatalytic removal of NO 3 – in simulated wastewater (which contained Cl – and SO 4 2– ) was almost unaffected. Because of the high efficiency, high stability, and low cost of CuO/NF, this catalyst is practical for the removal of nitrate for wastewater purification.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Guifang Wang,Jiangqi Wei,Guangchuan Liang,Yanli Chen,Shaojian Ma,Jinliang Zhu,Haiyan Liu
Montmorillonite (Mt) is widely used in various fields due to its abundant resources and excellent adsorption performance, while the hydration and adsorption properties of raw or functionalized Mt are affected by its intrinsic property, layer charge density (LCD). Herein, a series of reduced-charge montmorillonites (RC-Mt) with high, medium, and low layer charges were prepared by the method of lithiation and microwaving Ca-Mt. Meanwhile, the effects of artificially regulated layer charge density on Mt’s structure, hydration properties, and the removal ability of aqueous anions by the poly (diallyl dimethylammonium chloride) functionalized Mt (PDDA-Mt) were also investigated. Results showed that the LCD of Mt decreased with the increasing microwave time or power. In addition, the physicochemical properties of RC-Mt which included cation exchange capacity (CEC), colloidal index, and swelling properties decreased as the LCD decreased. Furthermore, the adsorption capacity of Mt for NO 3 - was significantly improved following the PDDA functionalization. The kinetic modeling suggests that the Pseudo-first-order model better characterized the adsorption of Ca-Mt and Li-Mt than the Pseudo-second-order model. On the other hand, the good fit of the Pseudo-second-order model implied that the adsorption process of nitrate on RC-Mt and PDDA-Mt is mainly driven by chemisorption control. The adsorption thermodynamics indicated that the adsorption process was spontaneous. Furthermore, the FTIR and XPS results suggested that in addition to diffusion and electrostatic interactions, the adsorption mechanism of PDDA-Mt was mainly attributed to the ion exchange between chloride and nitrate on the quaternary ammonium group of PDDA.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 17
·10067-10075
·
IF 3.119
Minghui Zan,Cong Li,Fei Liao,Lang Rao,Qian-Fang Meng,Wei Xie,Bei Chen,Xingwang Qie,Li Li,Liang Wang,Wen-Fei Dong,Wei Liu
In recent years, carbon dot (CD)-based fluorescent sensors for selective ions or small biomolecules have drawn great attention. In this work, highly fluorescent CDs (QY = 21%) were prepared from 2,3-diamino pyridine as the precursor through a facile solvothermal process. The CDs showed high stability and a green emission in aqueous, and the optimal emission wavelength of CDs is 508 nm under the excitation wavelength of 438 nm. Interestingly, a CDs-based nanoprobe was developed for a selective and sensitive fluorescence quenching response to NO2− in water, and the quenching mechanism was investigated in the work. Besides, the recovery rates of NO2− in the range of 98–103.5% were found to be acceptable, indicating that the proposed CDs could be act as potential candidates for determination of nitrite ions in real samples. Meanwhile, the nanoprobe was also successfully employed in a visualization biosensing platform for determination of NO2− in living cells due to its eminent biocompatibility.
研究领域:
分析化学
·
生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）